Coating for wire-drawing



NITED STATES PATENT OFFICE.

CHARLES S. HALL, ADDISON B. CLEMENOE, AND H. F. AUGUST SETTERWALL, OF\VOROESTER, MASSACHUSETTS.

COATING FOR WIRE-DRAWING.

SPECIFICATION forming part of Letters Patent No. 339,168, dated April 6,1886.

Application filed September 19, 1885. Serial No. 177,572. (Nospecimens.)

To CLZZ whom it may concern:

Be it known that we, CHARLES S. HALL, ADDISON B. OLEMnNoE, and H. F.AUGUST SET'rERwALL, all of the city and county of Vorcester, and Stateof Massachusetts, have invented an Improved Coating for \VirePreparatory to Drawing, of which the following is a full, clear, andexact description, enabling others skilled in the art to which itappertains to make and use the same.

In the manufacture of wire it is a wellknown fact that the coating ofsaid wire preparatory to drawing is a very important matter to beconsidered. A coating that will enable the accomplishment of certaindesired results without at the same time involving any seriousobjections or disadvantages to the manufacturer is of great practicalvalue, and has long been needed and sought for, much time and moneyhaving been expended in endeavors to improve the quality of coatings forthe above purpose. Up to the present time, however, the coatings in usehave not produced the most favorable results. While one coating mayprove entirely satisfactory in one or more respects, its otherobjectionable features destroy said valuable qualities, and thereforeresults, as above stated, in an imperfect coating.

So far as we have been able to ascertain all of the present coatings inuse embody the above objections in one form oranother to a greater orless degree. One of the most serious objections is the thick pastynature of some coatings,which it requires a long time to dry, and whichalso covers the wire unevenly, some places being thicker than others. Itis obvious'that such coatings require much more power in drawing thewire, and are also liable to absorb moisture after having been dried,therefore making it impossible to leave the unfinished wire on theblocks or reels over night without impairing the operation of drawingthe same next day. Another objection to a coating of an absorbing natureis that it does not properly protect the Wire covered by it fromcorrosion, some coatings even hastening rather than retarding said corroding process.

The object of our invention is to obviate as 0 far as is possible theforegoing objections to the present coatings.

It consists in immersing the wire,after having been cleaned in the usualway and preparatory to being drawn, in a solution of ace tate of ironalone, or a mixture of acetate of iron and lime, meal, flour, or anyother suitable and well-known lubricant in common use. Vc prefer inpractice to use lime with the acetate of iron, as it dries the coatingquicker, and aids in drawing the wire through the reducing-die.

The wire, having been cleaned in the usual way, as before stated, isnext immersed or dipped in the solution of acetate of iron, or the samemixed with slaked lime or any of the other common, well-knownlubricants, and then dried, after which it is ready to be drawn orreduced in size in the usual way.

In making the coating solution just suffi- 7c cient water is added tothe acetate of iron or other mixture to form a coating of the desiredthickness upon the wire to properly draw the same. As it adheres well tothe metal, it may be made very thin. It is deposited in a very uniformand smooth manner over the whole surface of the wire, and when dry formsa hard adhesive coating, which after the first draft through thereducing-dies is still further hardened to the consistency of cement.Therefore but little of the coating material is removed at each draft inthe reducing process, which circumstance enables it to be drawn down oneor more sizes smaller than by the use of the best of 85 other knowncoatings.

By the use of our coating the wire may be drawn down until it becomes sobrittle by reduction as to not admit of further reduction, 3. sufficientquantity of the coating material still remaining to properly protect thesurface of said wire.

As the coating does not absorb moisture, it dries quickly, and willtherefore not rust of acetate 01" iron and lime, meal, flour, or anyother common well-known lubricant suitable for the purpose,substantially as described.

CHARLES S. HALL. ADDISON B. OLEMENOE. H. F. AUGUST SETTERWALL.

Witnesses:

ALBERT A. BARKER, LUOIUS W. Bnreos.

